Let you teach, you play games with the worst class?

Damn chicken, what you said makes sense!

Can we share the same hatred with the enemy?

We are all diss teachers!

How much you affect unity!

Immediately, they switched targets and glared at Squad Leader Xiao Yang.

Squad leader Xiao Yang trembled instantly: "Well, I'm just telling the truth."

"Ah Wei..., you are right, don't say it again next time..." Li Cheng shook his head with a sigh, and patted the monitor on the shoulder sympathetically.

Immediately, he asked a more deadly question.

"If Mr. Ren is really guiding us to learn one after another..."

"You said these tools, would you..."

Hearing this, the boys gasped.

He hurriedly picked up a rusty tool and started working on the wood beside him.

really...

If their guess is average.

These tools are completely obsolete.

The traces of rust were almost half a centimeter thick.

not available at all...

At this moment, the eyes of the students went dark again, and they felt the deep malice from Ren Yan.

In the end, they had no choice but to grit their teeth and come to Ren Yan's side.

Squeeze out the voice word by word from between the teeth: "Teacher Ren, how to use those rusty tools, teach us!"

Ren Yan, on the other hand, clapped her ears with a smile, and poked in their direction by the way: "Ah, what are you talking about? Louder, I can't hear you clearly!"

"Teacher Ren, teach us how to use those rusty tools!"

"Ah, you say..."

"Teacher Ren, you are almost done!"

The students couldn't take it anymore and roared angrily.

"Be careful of us and your blood spattering five steps!"

Chapter 153 I finally found you!

Listen to the complaints of the students.

Ren Yan laughed to herself for 5 minutes before she stopped seeing the almost murderous eyes of the boys.

Then he cleared his throat, still looked at the group of boys with a smile, and said earnestly:

"Well, you can't blame the teacher, it's really pressure."

"You also know that if you don't do this, there is a high probability that you will not be able to learn..."

"Okay! We don't care about you anymore, tell us how to use the tool!"

Seeing Ren Yan's cheap and obedient face, the students in Class Nine felt their blood pressure soar instantly, but in the end they could only grit their teeth and proceed from a rational point of view.

Forgive me for my head teacher who 'specializes in anemia'.

"Okay, okay, I won't joke with you."

Ren Yan took a deep breath, adjusted his emotions and said:

"In fact, the so-called rust is the oxidation reaction between iron and oxygen in the air. The product is ferric oxide, which is the rust you can see."

As he spoke, Ren Yan picked up a branch and wrote down the reaction equation of iron and oxygen on the ground.

"This is chemistry?" the students asked in confusion.

"That's right, it's chemistry." Ren Yan nodded: "Since rust is produced through chemistry, it can naturally be eliminated through chemical methods."

"The elimination of these rusts is your next task."

"But I have to remind you that the rust you see is not just ferric oxide, but a combination of various impurities."

"As for how to remove it, you need to think for yourself."

"The only thing the teacher can tell you is the general method of removing rust in conventional factories."

"There, they often use acids and bases to remove light rust as well."

"As for me, I have also prepared some basic chemicals for you. As for whether you can successfully remove the rust, it depends entirely on you."

As she said that, Ren Yan pulled out a bag from behind, and took out various bottles and cans from it.

After he saw the rusty tools, he bought them in the imperial capital.

They are all very common medicines, and there is no restriction on purchasing them in small quantities.

"Oxalic acid, tartaric acid, citric acid, lake essence, sodium molybdate, phosphoric acid, glycerin..."

Looking at the names on those bottles and cans, the students in Class Nine suddenly felt dizzy.

The feeling of taking chemistry class in the class is back...

"Don't look at me with such eyes, I didn't force you." Ren Yan curled her lips, made a half-upward movement again, and leaned against a sheep behind her.

Needless to say, leaning against a living thing is much more comfortable than a dead thing.

When the sheep was approached by Ren Yan, it just turned around and ate grass on its own.

Watching the students feel pain for a while.

We're racking our brains and you're enjoying life? !

Can you be a little self-conscious as a class teacher? !

The students sighed again, and took these bottles and jars and prepared to go to the girl's place, let's study it together.

After all, relying on themselves alone, they might not be able to figure out what's going on until they die.

Seeing the students leaving, Ren Yan shouted: "Hey, by the way, it's best not to touch those reagents with your body, it will be harmful to some extent!"

"Especially sour!"

"Also, I have a book on rust removal, you can read it."

With that said, Ren Yan waved to the students and threw a booklet.

Looking at the booklets that fell down, the corners of the students' mouths twitched again.

"How many books did my teacher bring~"

......

After returning to the girls' place, the boys recounted the fact that they had discovered that Teacher Ren was setting them up.

Provoking the girls to follow along with the enemy together.

And have expressed.

Today they must not ask for a teacher again!

What if the other party sets him up again? !

Therefore, the rust removal work can only be done by them independently from now on!

Immediately, everyone plunged into the ocean of rust removal.

After nearly two hours of brainstorming, the students finally got a general understanding of the rust removal process.

In fact, to put it bluntly, it is to allow the rust to be reacted, corroded, and volatilized in the acid solution, and the concentration of the acid needs to be well controlled.

Otherwise, it is easy to corrode the main body together.

Of course, in order to make the prepared acid more effective during this period, it is necessary to polish some rust that is easy to clean.

Iron brushes, iron pins and the like are used in the book.

And here, apart from some rusty tools, the only things the students can use are some broken stones and a large plastic bucket of drinking water that has been filled before.

Fortunately, after using these things reasonably, they managed to remove the rust on the tool surface.

"Then the next step is to prepare the rust remover."

After all the tools were first derusted and washed with water to remove most impurities, everyone turned their attention to the chemical reagents that Ren Yan gave them.

The number of these reagents is not very large, after two hours of research.

They found that these reagents could make up to three bottles of rust remover.

Therefore, there are not many opportunities for trial and error left to them.

"Let's confirm it before preparing it." Looking at the reagent in front of him, the squad leader suggested.

The others nodded.

"The content of the acid should not be too much each time, just use 1-2 of them to mix the acid."

A classmate said:

"Also, the ratio of organic acid, lake essence, water and glycerin must be controlled within the range of 18:1:60:1, otherwise it will be difficult to achieve the desired reaction effect."

"There are additives..."

With the words and words of the students, some chemical equations about the rust remover were neatly listed and written on the ground.

Looking at these more critical points, Xia Yue took a deep breath and started the deployment work.

Among all the students at present, Xia Yue has the most stable hands, so this job falls on her.

As the reagents drop by drop into the same container, the reactions described in the book are presented to everyone one by one.

Look at the solvent that sometimes volatilizes, sometimes changes color, and sometimes makes noise.

The students suddenly experienced a different feeling in their hearts, as if they were creating a new thing with their own abilities.

Full of incredible and novelty.

But all of these actually appeared in front of my eyes.

As the last drop of the reagent dripped, the solvent completely returned to calm, and the color became transparent again.

However, the new solvent is slightly more viscous than the previous reagents.

"This is, the rust remover?"

Looking at the solvent in front of them, the students still couldn't believe it.

"It should be. The things described in that book, we have integrated all of them in a good way. It should be no problem."

Li Cheng said out loud.

"Then try it now! See if it can remove the rust." Li Qi followed suit.

The rest of the students didn't suspect him either, and watched Xia Yue drop a small amount of rust remover on the rusted saw blade.

One second, two seconds.

One point, two points.

As time goes by, the small piece that has been dropped by the rust remover gradually floats a layer of rust.

After Wang Bo washed it with some clean water, most of the rust in the original place had disappeared.

It is replaced by the original metallic color of the saw blade.

Although there are still sporadic rust spots, there is no doubt that they have succeeded!

"Damn it?! Really removed the rust!?"

"Awesome! Let's!"

Seeing the removed rust, the students in Class [-] immediately cheered.

A strong sense of accomplishment welled up in my heart.